<style>
  .container{
    border:1px solid red;
  }
</style>
<div class="container">
  <div class="head">

  </div><!--- End of head--->
  <div class="main">
    <div class="left">

    </div><!--- End of left--->
    <div class="right">

    </div><!--- End of right--->
  </div><!--- End of main--->
</div><!--- End of container--->
